Yeti or any of the knockoffs will work great for 3 days in heat. As others have mentioned keeping things cold has more to do with technique than build of the cooler. Yeti is top dog but nowadays there are much cheaper options that are as good.
Engel and ARB electric coolers are being mentioned. I mainly use a Engel 45 quart freezer/fridge weekend dry camping. A full-size auxiliary car battery in good condition will keep the Engel running for nearly 2 days straight with a recharge needed by the start of the 3rd day. It’s extremely efficient power-wise. Charge the battery directly from the Jeep or better yet get a portable solar panel that you can trickle charge your battery. Downside is these 12v compressor fridges are expensive to buy. They do last a longtime even in bumpy off-road conditions. Engel’s have become legendary over landing in Australia outback country.
Engel and ARB electric coolers are being mentioned. I mainly use a Engel 45 quart freezer/fridge weekend dry camping. A full-size auxiliary car battery in good condition will keep the Engel running for nearly 2 days straight with a recharge needed by the start of the 3rd day. It’s extremely efficient power-wise. Charge the battery directly from the Jeep or better yet get a portable solar panel that you can trickle charge your battery. Downside is these 12v compressor fridges are expensive to buy. They do last a longtime even in bumpy off-road conditions. Engel’s have become legendary over landing in Australia outback country.